I did the manual calibration and saved the calibration data(10 element). After power on, I start using the saved data and works fine.
Then, after running a short time(20M), I can see the heading is off and I checked that it is using 4 element real-time data now.
After running a long time(around 1 hour), I can see the heading is back to normal. Now using 10 element again.
It there anyway to control when I want to use the new calibrated data? The real-time calibration should be running the same way as now...